/*
 * Copyright 2017-present Open Networking Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.onosproject.netconf.cli.impl.completers;

import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

import org.apache.karaf.shell.api.action.lifecycle.Service;
import org.onosproject.cli.AbstractChoicesCompleter;
import org.onosproject.netconf.DatastoreId;

/**
 * Completer for predefined {@link DatastoreId}.
 *
 */
@Service
public class DatastoreIdCompleter extends AbstractChoicesCompleter {

    @Override
    protected List<String> choices() {
        // TODO: Ideally candidates should be chosen based on Device capability
        return Arrays.asList(DatastoreId.class.getFields())
                .stream()
                .filter(f -> f.getType() == DatastoreId.class)
                .filter(f -> Modifier.isStatic(f.getModifiers()))
                .map(f -> {
                    try {
                        return (DatastoreId) f.get(null);
                    } catch (IllegalArgumentException | IllegalAccessException e) {
                        return null;
                    }
                })
                .filter(Objects::nonNull)
                .map(DatastoreId::id)
                .collect(Collectors.toList());
    }

}
